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Vernier Permanent-magnet machine (VPMM) has been recognized in recent years as a substitute for permanent magnet synchronous machines (PMSM) in direct-drive applications such as wind turbine generators, motorcycles and electric vehicle/hybrid electric vehicle (EV/HEV) [1].
Low-speed direct-drive gearless machines are highly desirable for electric vehicle/hybrid electric vehicle (EV/HEV) propulsion due to the elimination of the associated gear wear, oil maintenance and acoustic problems. Conventional gearless direct-drive permanent magnet (PM) machines generally suffer from heavy weight, structural bulkiness, and lubrication problems. Due to the “magnetic-gearing” effect,...
Nowadays, numerous electrical machine topologies have been proposed and extensively investigated, which can extend the operating speed range together with the improvement of flux weakening capability without scarifying high efficiency. Amongst these machine topologies, variable-flux permanent magnet machines (VFPMs) are a competent candidate for electric vehicle/hybrid electric vehicle (EV/HEV) propulsion.
Traditional direct-drive permanent magnet synchronous machine (PMSM) suffers from large bulk and complex topology structure [1], which extremely limits its industrial applications. As a novel embranchment of PMSM, PM vernier machine (PMVM) incorporates the magnetic gear effects into conventional PMSM producing high torque at a relatively low speed, which is desirable for direct-drive applications...
Pole-changing permanent magnet (PM) machines, which can offer wide operating speed range, have attracted global attention in industry application [1-3]. However, the previous pole-changing PM machines adopting distributed winding, suffer from lengthy end winding and relatively low efficiency. Therefore, this paper presents a new variable flux pole-changing PM memory machine (VF-PCPMMM) employing fractional...
Transverse flux permanent magnet generator (TFPMG) has attracted a great attention for the large torque and high efficiency at low speed, as well as the prominent capability of carrying considerable pole numbers [1]. Many new TFPMGs with attractive structures have been proposed such as a novel flux switching transverse flux PM generator (FS-TFPMG) presented to improve the stator space utilization...
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